Hi thieliste,
I started by hi-end journey with a DR-10 driving Apogee Stages. That amp was so flat and lifeless than I took it back to the dealer and paid the 2X+ difference to get the DR-25. Night and day difference in those two. Still have the DR-25 and have used it for long periods to drive my 5i’s. Solidly built, musical, with plenty of current and as reliable as they come. The darker sound as compared to my DR-9 and Krell would likely work well to minimize the audible effect of the 6k peak of the 7.2s IMO.
The Ten, Fifteen, and TwentyFive were the next models following Dave Reich’s departure from Classe’. Glen Grue made some modifications to the input stage of Dave’s "DR" designs and they are generally said to be more lively, open, and dynamic sounding than the DR-10/15/25.
http://www.stereophile.com/solidpoweramps/1194classe/index.html#GCmxCxR9G3VUHeez.97 The Fifteen was considered the sweet spot of the line and would work very well for you as a temporary solution (if not more). Can’t say about the Ten. Sorry.
BTW- should you decide to buy one, use the SE (RCA) inputs as the XLR inputs use an opamp in the circuit that kills the sound. Apparently, Reich was forced to add it on by Grue after the fact and it shows.
Best to you thieliste,
Dave